Upon reading, the Sole Survivor gains a level of the Unstoppable perk which gives a +1% chance of avoiding all damage from an attack. This perk can be stacked up to five times, giving a 5% chance to avoid all damage.
The following is based on unverified behind the scenes information and has not been confirmed by canon sources.
The magazines appear to be a parody of Marvel's The Avengers series and DC's Justice League, two comics based on having different heroes from the same comic book universe team up to face different foes.
The "$15 Cheap!" price point mirrors the "Cheap" claim under the price point of classic issues of Mad Magazine.
End of information based on unverified behind the scenes information.